<!DOCTYPE html>
<style>
    .test {
        background-color: green;
        width: 30px;
        height: 30px;
        margin-bottom: 10px;
    }
</style>
<div class="test"></div>
<div class="test"></div>
<div class="test"></div>
<div class="test"></div>
<div class="test"></div>
<div class="test"></div>
<div class="test"></div>
<div class="test"></div>
<div class="test"></div>
